Preparation method of polystyrene foam microsphere

The invention provides a preparation method of a polystyrene foam microsphere. The preparation method mainly comprises the steps of: by virtue of manners of introducing a pore-forming agent into a polystyrene solution and introducing microbubbles through ultrasonic oscillation, preparing water-in-polystyrene-solution composite emulsifiable particles or polystyrene solid emulsifiable particles by virtue of a microfluidic technology, removing an organic solvent for dissolving a polystyrene-based polymer by virtue of a spin evaporation method and drying to remove water and residual solvent, thereby obtaining the polystyrene foam microsphere with narrow particle size distribution. The foam microsphere can be widely applied in the fields such as chemical catalysis and high-energy physical experiments.